Conventional incandescent lamp has luminous efficiency of 12 lumens / watt

Q.  A conventional incandescent lamp has a luminous efficiency of
- Published on 06 Oct 15

a. 10 lumens / watt
b. 12 lumens / watt
c. 14 lumens / watt
d. 14.6 lumens / watt

ANSWER: 12 lumens / watt

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